num1 = 9
num2 = 4
num3 = 5

print(f'乘法运算：{num1 * num2}')
print(f'除法运算：{num1 / num2}')
print(f'加法运算：{num1 + num2}')
print(f'减法运算：{num1 - num2}')

# python特有的运算符
print(f'整除运算：{num1 // num2}')
print(f'幂运算：{num1 ** num3}')